Some of the popular applications include. I am a Mechanical Engineer turned into a Piping Engineer. I am very much passionate about blogging and always tried to do unique things. This website is my first venture into the world of blogging with the aim of connecting with other piping engineers around the world.
Your email address will not be published. Save my name and email in this browser for the next time I comment. From the s the directional drilling process became popular due to the development of curvey For more than 50 years, Hydrogen piping and pipeline systems are in use.
There are several hundred miles of hydrogen pipelines that are laid to transport hydrogen to serve as fuel. Even though Skip to content. Join us on Telegram. Awesome post! I learned a lot!!! Thank you!!! The pumped liquid expands as it passes beyond the constriction and cavitation occurs. Suction recirculation also called internal recirculation is a potential problem observed with centrifugal pumps when operated at reduced flow rate.
This might occur, for example, when a discharge valve has been left partially closed or when the pump is being operated at a flow below the minimum recommended by the pump manufacturer.
Under these conditions, liquid may be ejected from the vanes back towards the suction pipe rather than up the discharge port. This causes turbulence and pressure pulses throughout the pump which may lead to intense cavitation. Air can be sucked into a pumping system through leaking valves or other fittings and carried along, dissolved in the liquid. Air bubbles may form within the pump on the suction side, collapsing again with the higher pressure on the discharge side.
This can create shock waves through the pump. This type of cavitation can be prevented by regularly checking all valves and joints, O-rings and mechanical seals for signs of leaks or erosion. To avoid cavitation, the pressure of the fluid must be maintained above its vapour pressure at all points as it passes through the pump. Consequently, it is important to build in a safety margin about 0. Positive displacement pumps require an inlet pressure to be a certain differential greater than the vapour pressure of the fluid to avoid cavitation during the suction phase.
Manufacturers may quote NPIP-R as the recommended inlet pressure and provide charts showing how it varies with pump speed. Cavitation is a potentially damaging effect that occurs when the pressure of a liquid drops below its saturated vapour pressure.
Under these conditions it forms bubbles of vapour within the fluid. If the pressure is increased again, the bubbles implode, releasing damaging shockwaves. This can cause severe erosion of components. Posted 17 December - PM. Does cavitation takes place in positive displacement pumps? Do they require priming?
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